Photosynthetic physiological response of Bretschneidera sinensis seedlings to light intensity
-
摘要: 为探讨伯乐树Bretschneidera sinensis幼苗的适宜光强环境，并为伯乐树幼苗的人工繁育及种群复壮提供参考，达到保护这一濒危物种的目的，比较研究了不同光强下（1 450.00，550.00和200.00 molm－2s－1）伯乐树幼苗的光合日变化、光响应曲线、二氧化碳响应曲线以及形态指标等相关参数。结果表明：气孔导度、蒸腾速率和光合速率的日变化均以全光处理下的较高；光强相对较高环境下（1 450.00和550.00 molm－2s－1）伯乐树幼苗叶片的表观光合速率、最大光合速率、最大羧化速率和羧化效率等光合参数值均显著较高（P＜0.05），幼苗表现出良好的生长态势，说明伯乐树幼苗喜光。同时，不同光强处理下伯乐树幼苗叶片的光补偿点分别为21.22，19.93和14.95 molm－2s－1，其值均较低，说明伯乐树幼苗也较耐弱光。较高光强有利于伯乐树的光合作用，植株长势健壮，株高和地径相对较大。建议在进行伯乐树幼苗人工繁育时，不宜过度遮荫光；在原生地抚育时，应适当增加林窗的光照强度。图4表2参20Abstract: Bretschneidera sinensis, an endemic species in China and one Chinas national first-level protected wild plants, is a particularly rare, severely endangered, and protected plant whose conservation for biodiversity is needed. This study determined the effect of different light intensities on the photosynthetic physiological response of B. sinensis and offered some suggestions for conservation. The photosynthetic characteristics of B. sinensis seedlings grown outdoors were studied with different light intensities （1 450, 550, and 200 molm－2s－1）. Results showed that daily changes in stomatal conductance, transpiration rate, and photosynthetic rate with 1 450 molm－2s－1 were higher than with 550 and 200 molm－2s－1. As light intensity decreased, the maximum photosynthetic rate （Pmax）, the light saturation point （LSP）, the carboxylation rate （CU）, and the maximum rate of carboxylation （Amax） all decreased. Therefore, light intensity should be considered carefully when biodiversity conservation of B. sinensis to be carried out. ［Ch, 4 fig. 2 tab. 20 ref.］
-
Key words:
- plant physiology /
- Bretschneidera sinensis /
- seedling /
- light intensity /
- photosynthetic physiological
-
-
链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.05.009
点击查看大图
计量
- 文章访问数: 2678
- HTML全文浏览量: 479
- PDF下载量: 515
- 被引次数: 0
下载:
